Binomial Expansion with Negative Coefficient

Expand the expression $(9-6x)^{ rac{3}{2}}$ to 4 terms in ascending powers of $x$ .

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H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. XIV. Binomial Theorem: Any Index, Examples XIV.a, No. 14

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Checked against the answer in H. S. Hall & S. R. Knight, Higher Algebra (1891).